What are some examples of polar molecules?
Water is an example of a polar molecule. To be polar, molecules need to contain polar bonds, AND the arrangement of these bonds must be asymmetrical.
Polar bonds arise when two atoms bond together that have different electronegativities. For example, the O-H bonds in water. In polar bonds the electons are share unevenly. This creates a temporary dipole in which one end of the bond is more negative than the other.
In a symmetrical molecule the dipoles cancel each other out so the end result is a non-polar molecule.
Other examples of polar molecules include HF,